Oracle数据库中的Cache对象（4）

DATA FILE #1: 
  (name #7) +ORADG/danaly/datafile/system.264.600173859
creation size=38400 block size=8192 status=0xe head=7 tail=7 dup=1
tablespace 0, index=1 krfil=1 prev_file=0
unrecoverable scn: 0x0000.00000000 01/01/1988 00:00:00
Checkpoint cnt:45507 scn: 0x081a.88397cdd 04/19/2007 10:36:17
Stop scn: 0xffff.ffffffff 01/27/2007 17:56:34
Creation Checkpointed at scn:  0x0000.00000007 09/03/2006 10:57:47
thread:1 rba:(0x1.3.10)
enabled  threads:  01000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000
Offline scn: 0x0000.00000000 prev_range: 0
Online Checkpointed at scn:  0x0000.00000000 
thread:0 rba:(0x0.0.0)
enabled  threads:  00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  00000000 00000000 00000000 00000000 00000000 00000000
Hot Backup end marker scn: 0x0000.00000000
aux_file is NOT DEFINED 
V10 STYLE FILE HEADER:
        Compatibility Vsn = 169869568=0xa200100
        Db ID=3965153484=0xec5770cc, Db Name='DANALY'
        Activation ID=0=0x0
        Control Seq=2912565=0x2c7135, File size=84180=0x148d4
        File Number=1, Blksiz=8192, File Type=3 DATA
Tablespace #0 - SYSTEM  rel_fn:1 
Creation  at  scn: 0x0000.00000007 09/03/2006 10:57:47
Backup taken at scn: 0x0000.00000000 01/01/1988 00:00:00 thread:0
reset logs count:0x23c5ed0c scn: 0x0000.00000001 
reset logs terminal rcv data:0x0 scn: 0x0000.00000000
prev reset logs count:0x0 scn: 0x0000.00000000 prev 
reset logs terminal rcv data:0x0 scn: 0x0000.00000000
recovered at 01/28/2007 21:29:12
status:0x2004 root dba:0x00400179 chkpt cnt: 45507 ctl cnt:45506
begin-hot-backup file size: 0

SQL> select COUNT(*) from dba_segments 
where segment_type='CACHE';

  COUNT(*)
----------
        0